Classifications

• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
  • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
  • A61F2/02—Prostheses implantable into the body
  • A61F2/30—Joints
  • A61F2/3094—Designing or manufacturing processes
  • A61F2/30942—Designing or manufacturing processes for designing or making customized prostheses, e.g. using templates, CT or NMR scans, finite-element analysis or CAD-CAM techniques
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
  • A61B3/00—Apparatus for testing the eyes; Instruments for examining the eyes
  • A61B3/02—Subjective types, i.e. testing apparatus requiring the active assistance of the patient
  • A61B3/028—Subjective types, i.e. testing apparatus requiring the active assistance of the patient for testing visual acuity; for determination of refraction, e.g. phoropters
  • A61B3/04—Trial frames; Sets of lenses for use therewith
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61C—DENTISTRY; APPARATUS OR METHODS FOR ORAL OR DENTAL HYGIENE
  • A61C13/00—Dental prostheses; Making same
  • A61C13/0003—Making bridge-work, inlays, implants or the like
  • A61C13/0004—Computer-assisted sizing or machining of dental prostheses
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61C—DENTISTRY; APPARATUS OR METHODS FOR ORAL OR DENTAL HYGIENE
  • A61C19/00—Dental auxiliary appliances
  • A61C19/04—Measuring instruments specially adapted for dentistry
  • A61C19/05—Measuring instruments specially adapted for dentistry for determining occlusion
• • G—PHYSICS
  • G16—INFORMATION AND COMMUNICATION TECHNOLOGY [ICT] SPECIALLY ADAPTED FOR SPECIFIC APPLICATION FIELDS
  • G16H—HEALTHCARE INFORMATICS, i.e. INFORMATION AND COMMUNICATION TECHNOLOGY [ICT] SPECIALLY ADAPTED FOR THE HANDLING OR PROCESSING OF MEDICAL OR HEALTHCARE DATA
  • G16H20/00—ICT specially adapted for therapies or health-improving plans, e.g. for handling prescriptions, for steering therapy or for monitoring patient compliance
  • G16H20/40—ICT specially adapted for therapies or health-improving plans, e.g. for handling prescriptions, for steering therapy or for monitoring patient compliance relating to mechanical, radiation or invasive therapies, e.g. surgery, laser therapy, dialysis or acupuncture

Definitions

• the invention relates to a method for the construction of a human prosthesis to be used for partially or totally removing a physical dysfunction through determination of the preferred value of a parameter serving the patient's optimum comfort and being characteristic for the removal of the dysfunction by drawing a judgment from the patient regarding the parameter characterizing values, which values, in a number sufficient for statistical analysis, are presented, to him as a series of increments randomly varying with about the perceptive precision, whereafter the preferred value is calculated and the prosthesis is constructed using the calculated preferred value.
• Such a process for edentulous patients is investigated by van Willigen,
• the above-mentioned "forced choice” method comprises offering the patient a random choice of vertical dimensions of occlusion, measured in increments of 0,5 mm ranging from 0,5 to 6 mm by correspondingly adjusting the micrometer.
• the highest and the lowest value of the measuring range corresponded to the experience of respecively "too high” and “too low” as criterion for the desired occlusion for the prosthesis.
• the patient was instructed to comment on each presentation of the vertical occlusion as either "too high” or "too low”. In between two subsequent measurements the time interval was 10 seconds.
• Object of the invention is a method for the construction of human prosthesis as decr ⁇ bed in the above within the scope of which the step of determining the preferred value of a parameter being characteristic for the prosthesis is improved i.e. is more rapid and more accurate.
• the invention is characterized in that the composition of the series of randomly varying values for the calculation of the preferred value is completely microprocessor-controlled and is chosen from a series of values spanning across the preferred value; the values relevant for the calculation of the preferred value are administrated and said preferred value is calculated.
• Moverover the method according to the invention provides the possibility to i ⁇ eorporate the microprocessor-controlled system based on which the random series of the relevant measuring values is composed, in a device the operation of which being so much simplified that it may even be left to not-university trained persons.
• the invention therefore also relates to a device to carry out the method according to the invention characterized by an assembly comprising a series of measuring gauges with a dimension relevant for the determination of the preferred value, the value of which in said series of measuring gauges is varying in the order of the perceptive precision and said values being randomly distributed across the preferred value with sufficient width to compensate for the variability per patient; indicator means provided with a strigical display system coupled to a microprocessor-controlled system for the composition of the series of random parameter values; and means for the operation of the indicator means.
• the perceptive precision is dependent on the nature of the parameter to be measured; in case of, for example, the determination of the occlusion to construct a dental prosthesis, the perceptive precision is in the order of 0,5 mm; however if the manufacture of orthopaedic foot-wear is concerned then the perceptive precision for the relevant parameter, for example the vertical height of the heel, will be more in the order of 0,5 cm.
• the invention will now be elucidated with reference to the accompanying drawing which shows an example of the embodiment of a device to be used for determining the PVDO in connection with the manufacture of a dental prosthesis.
• fig. 1 in perspective view shows a device the assembly of which comprising ganges, indicator means and operating means being combined to an apparative unit, and fig. 2 the flow sheet belonging to the device according to fig. 1.
• the device is shown at 1, the indicator means of which is housed in the cabinet 2 At the upper side of the cabinet 2 recessesare provided in an amount equal to the amount of measuring gauges removably held in said recesses i.e. gauges 3.
• gauges may be manufactured out of any material which is not detrimental to the patient's health and which furthermore communicate dimensional stability to the gauges.
• Their crosssectional form is rectangular the width of which is the measure determining the vertical occlusion. Based on their width they are suitably assemblied in groups corresponding to width dimensions of about 0,5-9,5 mm, about 10-19,5 mm and about 20-24,5 mm, always varying with the same increment of about 0,5 mm.
• the number of gauges is thereby chosen so that, taking into account the variation occurring in practice regarding the PVDO value, there always is sufficient distribution across the PVDO-values possible as well as that a sufficient number of
• the press switch "too low" Not shown is the switch for the device to be switched on or off.
• the dental surgeon or dental assistant needs to construct the assembly of lower and upper baseplates for the patient to be examined, each of these baseplates being provided with a platform at the front and being so constructed that after placing the baseplates into the patient's mouth the platforms contact each other when the patient brings them into occlusion.
• both platforms are so constructed that when the patient brings them into occlusion he considers the position of his lower jaw relative to his skull to be "too low”.
• the diagnostician After placing the upper and lower baseplates in the patient's mouth the diagnostician start the microprocessor by pressing the press swith 5. On the display 4 the chosen gauge is strigically shown. The diagnostician selects the gauge of the chosen size and places it between the upper and lower platforms of the baseplates with its width dimension in vertical direction. The patient bites on the gauge and decides whether the position ⁇ f his jaw relative to his skull is experienced to be "too low” or "too high”. The diagnostician then enters the answer into the device by pressing either the swith 6 ("too high") or the switch 7 ("too low”).
• the num erical indication of the gauge on the display 4 is replaced by another one by the microprocessor and the diagnostician repeates the procedure. This, process continues until the microprocessor shows on the display that a sufficient number of observations have been taken whereafter the microprocessor will show on the display the width dimension of the gadge which the patient during testing has not consistently considered as "too low” or "too high". This dimension corresponds to the PVDO and appears on the display with the decimal point flashing.
• Fig. 2 shows a flow sheet of the device according to fig. 1.
• both the method and the device according to the invention may be used for every psychophysical measurement for the manufacture of prosthesises or for diagnostic purposes; for example: by substituting lenses of increasing strength, for the gauges the device is made suitable for ophtalmic examination.
• the invention is suitable to be used in the field of audiology or rehabilitation medicine.

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• Health & Medical Sciences (AREA)
• Life Sciences & Earth Sciences (AREA)
• Veterinary Medicine (AREA)
• Engineering & Computer Science (AREA)
• Public Health (AREA)
• General Health & Medical Sciences (AREA)
• Animal Behavior & Ethology (AREA)
• Oral & Maxillofacial Surgery (AREA)
• Biomedical Technology (AREA)
• Epidemiology (AREA)
• Heart & Thoracic Surgery (AREA)
• Physics & Mathematics (AREA)
• Dentistry (AREA)
• Orthopedic Medicine & Surgery (AREA)
• Cardiology (AREA)
• Manufacturing & Machinery (AREA)
• Geometry (AREA)
• Transplantation (AREA)
• Vascular Medicine (AREA)
• Biophysics (AREA)
• Ophthalmology & Optometry (AREA)
• Medical Informatics (AREA)
• Molecular Biology (AREA)
• Surgery (AREA)
• Prostheses (AREA)
• Dental Tools And Instruments Or Auxiliary Dental Instruments (AREA)

Applications Claiming Priority (2)

Publications (1)

Family

ID=19839359

Family Applications (1)

Country Status (3)

Cited By (2)

Citations (4)

• 1982
  • 1982-03-03 NL NL8200868A patent/NL8200868A/nl not_active Application Discontinuation
• 1983
  • 1983-03-03 WO PCT/NL1983/000008 patent/WO1983003049A1/en not_active Application Discontinuation
  • 1983-03-03 EP EP83900854A patent/EP0102983A1/de not_active Withdrawn

Patent Citations (4)

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